Newbie is very hard to join signature campain. Some threads accept it but only very small.
Newbies are not supposed to join signature campaigns as they are new to the industry and has not enough knowledge about bitcoin so they would surely not be able to do constructive posts, that is why they should firstly learn something and after that they should think of joining a campaign.
Well. in most cases this thing could be apply on newbies. but the situation could not be same everytime. lots of newbies here who are just newbies in the bitcointalk but not newbies in bitcoin industry. I my self know some bitcoin exchanger and traders who very well know bitcoin and it's factors but they are not even in the forum.
and the second thing is those signature campaign who allowing newbies to join their campaign, really don't expect high quality posts from them. they surely know that a newbie can't write good posts.
So I think a newbie if get a chance to join a signature campaign then he must take advantage of the chance. newbie need 1 month to become Jr Member and 2 month to get a Mamber Status. so if he can earn some bitcoin while ranking up his account then. this is not a bad thing at all.